Molding machine



May 23, 1933.

w. H. NlcHoLLs Er AL. 1,910,354

MOLDING MACHINE Filed Nov, 19. 1930 3 Sheets-sheet 1 ATTORNEYS May 23,1933. w. H. NlcHoLLs ET AL 1,910,354

MOLDING MACHINE Filed NOV. 19, 1930 3 Sheets-521961'l 2 INVENTORSWlLLlAM H.NlC. O L ARTH R D. ZI

w if/zo ATTORNEY I May 23. 1933- w. H. NlcHoLLs ET AL 1,910,354

MOLDING MACHI'NE Filed Nov. 19. 1930 3 Sheets-Sheet' 3 10/ 90 V11/fzWq/g. 10.

NVENTORS l WILLUMVI H. NICHOLLS ARTHU D, ZIEBARTH MQW AT QRNEYS PatentedMay 23, 1933 UNITED STATES PATENT" oFFlc WILLIAM H. NICHOLLS, OF OLDWESTDUBY, AND ABTHUR,D. ZIEBARTI-I, OF KEW GARDENS, `NEW YORK,ASSIGNORS, BY DIRECT .AND .-MESNE ASSIGNMENTS, TO Y WM. H. NICHOLLS C0.INC., OF. RICHMOND HILL; NEW YORKQA CORPORATION OF v NEW YORK MOLDINGMACHINE .Application led November 19, 1930. Serial No.l 496,670. v

Important objects of the present invention are, to provide a roll-overmolding machine of generally improved design; to provide such .a machinewhich will be efficient a-nd easy to operate; to provide a roll-overmolding machine wherein j olting mechanism, mold-squeezing mechanism andpatterndrawing mechanism are all embodied in a roll-over unit mountedfor rotation about a lateral axis; to mount said unit so that it will besubstantia-lly balanced about its axis of rotation and will roll overeasily; to provide satisfactory means for operating the jolt; squeezeand draw mechanisms of said rotatable means by fluid pressure; toprovide simple and satisfactory fluid pressure operated means forperforming the roll-over operation; to provide means designed tofacilitate the control of the fluid pressure operated means; to providean improved roll-over molding machine of the trunnion type; to provide aroll-over molding machine whereina flask and pattern support and asqueeze head are joined together and supported in a unit by fluidpressure operated mechanism for squeezing and pattern drawing andwherein said mechanism in turn has a lateral trunnion which is mountedto rotatably support the unit; to provide in a molding machine improvedfluid pressure operated means for mold squeezing and pattern drawing;and to provide other improved features which will appear hereinafter.` f

In the drawings, Fig. 1 is a plan View of the molding machine; A

Fig. 2 a vertical section taken on the line 2 2 of Fig. 1;

'Figa 3 a side view of the machine upon a smaller scale showing thesqueezing operation.; Fig. 4 a fragmentary sectional View of the machineshowing the pattern-drawing operation; i l e Fig. 5 an elevation of themachine looking toward the opposite side thereof;

Fig. 6 a section taken on the line .6 6 of Fig. 2; l 1

Fig. 7 a detail section taken on the line 7 -7 of Fig.`,2; f-

' Fig. 8 a front elevation of a portion of the machine; v

Fig. 9 a sectional View of thel roll-over control valve;

Fig. 10 a section taken on the line `10-10 of Fig. 9; and l l Fig. 11 asectional vview of one of the chec valves ofthe roll-over control pipes.

The molding machine comprises broadly, a

pedestal l and a mold-forming roll-over unit 2. Said unit is mountedupon thepedestal for substantially balanced rotation about 1a lateralaxis and includes all of the ymechanism required for jolting, moldsqueezing and pattern drawing. These operations are. performed by meansof fluid pressure, and fluid pressure is also employed for rotating theunit.,`

The pedestal' 1 comprises a hollow casting formed with a broadbase 3which, in the present instance, is bolted as at 4 to a foundation 5. Atits upper end the pedestal casting is formed with a long, horizontalbearing-box 6 which tapers toward one end, is formed within its largerend with a cylindrical bear* i ing surface 7 andwithin its smallerendwith a materially smaller cylindrical bearing surface 8. Within thehollow upright portion of the pedestal is mounted a fluid pressureoperated mechanism for effecting the rollover, as will be describedhereinafter.V e

The mold-formingunit 2 includes aca-string forming arather longcylinder') which is normallyfupright and has a closed lower end 10 andanVopen upper end. -At a point near the upper end the vcastingisintegrallyformed with a long, hollow,laterally extending trunnion 11which extends through the bearing box 6 and is correspondingly tapered.I Cylindrical bearing'surfaces 12 and 13 formed upon the trunnion opposethe bearing surfaces 7 and 8 respectively of the bearing box, andanti-friction rollers 14 are interposed between said opposed bearingsurfaces.k The rollers are confined endwise by ribs 15 formed upon thetrunnion, by a plate 16 bolted to the free end of the trunnion and by aflat surface 17 formed upon the cylinder 9, around the root of thetrunnion. The plate 16 abuts the outer end of the bearing box to preventwithdrawal of the trunnion, and a circular rib 18 formed upon thecylinder 9 fits around the opposite end of the bearing box. At its freeend the trunnion is formed with a reduced nipple-like extension 19having a bore opening into the interior of the hollow trunnion andforming part of a fluid pressure supply connection for vthemechanismsofthe roll-over unit. f

` Near its lower end the cylinder casting 9'is integrally formed with alateral. extensionv projecting in an opposite direction from thetrunnion and defining a smaller cylinder 20 extending parallel tocylinder 9, and any oil chamber 21 between said cylinders. der 2O isclosed at its lower end' and open at `its upper end andforms part of ajolt mechanism. vA hollow jolt piston 22 is fitted to reciprocate inlthe cylinder and has a Hat table 23 cast upon its upper end and normallyresting upona flat surfacev 24fsurroundin 'the open end ofthe cylinder.Saidtable orms a support for a mold flask and a carrier for a moldpattern. For the admission of fluid pressure to the jolt cylinder forthe jolting operation said cylinder is formed with an admission port 25upon itsy outerV or forward side, spaced upward from the lower end ofthe jolt piston in the normal position of the latter. Port 25 opens intoan annular groove 26 formed in the piston,.and said groove communicatesthrough apertures 27 with a cavity 25E-formed in thelower end ofthe.piston. Below the port 25 the cylinder is formed with an. exhaust port29 normally closedl by the piston..

Fluid vunder pressure' is supplied to admis- *sion` port 25 through` aval-ve 30mounted upon the cylinder. Said valve is normally closed by thefluidpressure assisted by spring pressure if required and has aforwardly extending` stem 31 for opening it. A lever 32 is pivoted as at33 to the casingl of the valve and has a depending armengageable withthek valve stem for pushing it inward: and adapted to be pressed by theknee of the operator. A tension spring 34 is anchoredy to the upper endof the lever and to the cylinder and normally holds the leverrocked'a-wayfromy the valve stem.l Lever 32.v also serves fortheretraction of a lock which is provided to hold the jolt piston in placewhen rolled over. Said lock comprises a bolt 35 slidable .a bore formedtheifront of the cylinder and having a tapered inner end engageable inatapered keeper aperture formed in a bush-.ing 36 mounted in thepiston.M At its outer end the bolt .has a pin and slot operativeconnection 37T with the lever at a point between the pivot of the leverand the spring connection, so that the spring normally holds the bol-tengaged inthe keeperaperture. When thev lever is rocked?, however foropening the valve 30 the bolt is "alsoretracted to permit jolting move'-rnen-t of the piston'. Preferablythere is suiicient clearance betweenthe lever and the Cylinvalve stem to permit retraction of the boltbefore the stem is engaged.

The jolt piston is prevented from turning, and. from moying too faroutward under some circumstances by a bolt 38 screwed into the table 23,slidably fitted in a boss formed in the top wall of the oil chamber andextending down into said' chamber where it is provided with a stop nut39 engageable withsaid boss. v Directly beneathfthe lbolt the lower wallof the oil chamber is formed with an aperture giving access to the nutand normally closed by a threaded lug 40. Similarly the lower end of thejolt cylinder has an aperture normally closed by a threaded plug 4l.Within the oil chamber is an oblique [in 42 which combines with thewalls to-,form'a trough, when inrolled over position, and' one or moreoil ports 43 leadf from saidtrough to the -interior of the jolt cylinderfor lubrieating it. Anfoily pipe'43 leads from the oil chamber to theinterior of the cylinder 9.

Slidably fitted inthe large cylinder 9 is a long, hollow, cylindricalplunger 44 which forms a shiftable supportfor a squeeze head t 45. Theupper. end of the plunger is closed by a head 461 bolted thereto as at47 and its lower endis closed. by a piston-like head 48 yfitted intheplunger and secured to it by screws 49.- At a medial point in the lengthof theplunger a'pistoir-l-i-ke partition disk 50 isvfitted rin theplungerand secured by screws 5l. Astem'Q extends through the plungeralong the axisther'eof. At its lower end said stern-is fixed` to.the-closed end of head 46 and hasa pistonv 56 fixed to it and having a.sliding fit in the plunger. Said piston has an aperture through whichthe end Vof the stem is passed and the 'stem is threaded and has twonuts57 and 58 screwed upon it and tightened againstl opposite lfaces of thepiston. At a point between the lower plunger head and the partition diskor piston 50, and preferably nearer the. latter, another piston 5.9 isfixed tothe stem and has a sliding fit in the plunger, the stem beingpassed through an aperture inthe piston, threaded and having two nuts 59screwed upon it and tightened against the opposite faces of the piston.

Pistons 56 and 59 have packing engaging the plunger, and the plungerpistons 48 and 50 have packing engaging the stem, to prevent leakage.l'Ihe'interior'of the plunger is divided by the various pistons intothree fluid expansion chambers 60, 61 and'62. vChamber 60 is locatedbetween the upper plunger head 'les 'lis

tion. i Admission of sufficient fluid pressure to' "1 a threaded bore inthe free stem has a fluid `passage 63 extending the length thereof, andlateral ports 64 and 65 through which said passage communicates with thechambers 61 and 62 respectively. The upper end of passage 63 is closedby a plug and its lower end has a fluid supply and exhaust connection. Aport 66 leads through the plunger head 47 into the chamber 60 and alsohas a fluid supply. and exhaust connecehamber will cause the plunger tomove upward with reference to Fig. 2, since the plunger is movable incylinder 9 while the piston 56 is fixed. Thereby the squeeze head 45 ismoved farther away from the Vflask support 23. This movement isautomatically limited by a locking means comprising a hook 67 which ispivoted, as at 68, to the under side of the plunger head 47 and isadapted to gravitate into engagement with a loop 69 formed upon the nut57, and anchor thereto. Admission of fluid pressure to the chambers 61and 62 through the stem passage 63 and ports 64 and 65 acts upon theplunger pistons 48 and 50 to force the plunger downward.

Thereby the squeeze head is moved toward the flask support formold-squeezing and for holding the flask in place during the rolloveroperation.

The mounting for the squeeze head 45 includes a lateral arm 70. An ear71 Vis formed upon the plunger near the upper end thereof and the arm isformed with a forked end which straddles said ear and is pivoted lthereto upon a pin 72 for lateral swinging of the squeeze head into andout of register with the flask support. The squeeze head is providedwith an upwardly extending central shank 7 3 which screws upward throughend of the arm and supports the squeeze head for vertical adjustment. Ahand grip 74 is formed .upon the free end of the arm for swinging it,and the pivoted end of the arm is formed with a stop lug 75 engageablewith the plunger to limit the swing of the arm which brings the squeezehead into register with the flask support.

Within the hollow pedestal 1 is a mecha nism for effecting theroll-overof the moldforming unit upon the trunnion 11. This mechanism includes ashaft 76 mounted in bearings 77 near the base of the pedestal. Asprocket wheel 78 is fixed to said shaft, an-

other sprocket wheel 79 is fixed -to the trunnion and a drive chain 80is trained over said wheels. An adustable device 81 is provided fortensioning the chain. Between the `trunnion 'and shaft7 6 extends acylinder Said cylinder has a closed upper endl formed with an ear 83which isvpivoted upon a pin 84 fixed within the pedestal. A piston 85 isfittedin the cylinder and has a piston rod 86 extending downward througha removable head 87 closing the lower end of' the cylinder. At its lowerend the piston rod is operatively connected to a crank 88 fixed to shaft76. The cylinder has fluid admission and exhaust connections .at itsopposite ends for reciprocating the piston. A valve 89 is provided forcontrolling the fluid pressure in the cylinder. i

Valve 89 comprises a body or base 90 and a cap 91 defining a chamber 92and bolted to each othery and to a plate 98. The latter covers anopening in the side of the pedestal nearest the roll-over unit and isbolted to the pedestal. A valve seat 94 is formed upon the valve bodywithin the chamber 92, and a disk valve 95 is rotatably mounted uponsaid seat and is formed withtwo ports 96 and 97 spaced around its axis,and with a radial cavity 9.8 opening inward toward the valve seat. Astem 99 for rotating the valve is rotatably fitted in a bore formed inthe valve body and is fixed to the valve. An axial passage 100 formed insaid stein communicates with the valve cavity 98 and places the latterin communication with a lateral .exhaust port 101 formed in the valvebody.- The stem extends outward through an opening in thevalve-supporting plate 93 and is provided with an operating handle 102vforming two` oppositely extending arms' having eyes vat theirextremities. The valve seat is formed with two ports 103 and 104 spacedaround the valve axis a less degree than the valve ports 96 and 97. Aflexible tube or hose 105 connects port 103 to the upper end of thecylinder 82 and a flexible tube or hose 106 conneots port 104 to thelower end of the cylinder. Y Connected to the valve cap 91 is a fluidsupply pipe 107 opening into the valve chamber 92. A spring 108interposed betweenv the cap and thevalve assists the fluid pressure ltohold the valve upon its seat. Each of the tubes and 106, adjacent itsconnection with the cylinder, is provided witha check valve 1,09 openingtoward lthe cylinder but exhaust of the fluid back to the tube.

l/Vhen the handle v102 is rocked in one direction valve port 96 isbrought into register with port 103 for supplying fluid pressure to theupperend ofqcylinder`82 and the valve cavity 98 isregistered with port104 forthe exhaust of the cylinder below the piston 85. Thereby thepiston is forced downward to cause rotaton of the roll-over unit torolled over positionV through the operative connection between thepiston and the trunnion 11. lllhen the handle is rocked in. the'opposite direction valve port 97 is registered with port 104 and valvecavity 98 is registered with port 103 for admission 0f` fluid pressure'to the provided with a bleed port 110 permitting lovver end of cylinder82' and exhaust of: pressure from Vthe upperY endet' .the Cylinder.Thereby the piston is forced uplwardtofroll yback the roll-overunit .tonormal position.

Movement of the valve disk to etherof said positions is limited byengagement? oza stop pinlll with the ends of a slot 112 formed in thedisk. The roll-over movement of :the unit is limited by Contact of astop 113 formed upon the plunger 44 Withone side of an elongatedzstoprib 114 formed upon the pedestal. Roll back movement of theunitislimited by contact of a stop llormed upon cylinder with the oppositeside of the-rib 114.

Means are providedor convenient operation of the valve89 from the frontof the machine. .This meansl includ-es a: horizontal rock shaft 116extending fore and aft above the roll-over unit. Saidv shaft is mountedinbearings supported byan L-shaped bracket 117 supported upon thebearing box 6'; Centrally fixed to the rear end of shaft 116 `is-a crossbar 118 similar tothe valve handle 102 and having its kends operativelyconnected to the ends of the handle by pull-cords119." A similar crossbal" 120 iscentrally fixed to the opposite endv of the :rock shaftandhas tWo pull cords 121 depending Vfrom its ends and provided withhandles '122 Within 'the reach of an operator. `Tl1e cross arm 120 isnormolly held horizontal'by a tensionspring-123 which is anchored to acentrally depending Alug formed upon the lcross arm and to a dependingear 124 carried bythe bracket 117.

Mounted upon one side of the large cylinder 9 is a valve 125 forcontrolling the squeezing and pattern-drawn operations of the rolloverunit. This valve is substantially a duplicate of valve 89 and a detailshowing and description of it is thought to be unnecessary. A pipe 126leads from 'the valve tothe lower end of the stem 52 and the passage 63'therein. Another pipe 127 leads from the valve-"to lthe port 66 at theupper end vof the plunger 411i Pipe 127 is formed in telescopingsections to permit movement of the plunger 'and is suitably packed toprevent leakage, The valve has an operating handle 128.

Fluid, preferably air under' pressuref'is' supplied to the jolt valve43(7) 'andthe squeeze and drawvalve 125 `through vthe hollovv'trunnien11. A main supply pipe129'is c'onnected to the nipple 19 of the plungerby a ysuitable stuffing box structure 130,1 and apassage, 131 formed incylinder 9 leads obliquelyout- Ward. 7 A pipe 132 connects said port tovalve 125, and afbranchpipe lconnects pipe 132 to the jolt valve 30;`Pipe107 which supplies the'valve 89 for the roll-*over and roll-backoperations, leads from the supply pipe 129.` The machine is operated asfollows Valve 125 is manually operated to admit air which is suppliedthrough the trunnion, into pipe 127 and thence to port 66andthe'uppermost chamber of the plunger. This operation 'of the valvealso vents the lplunger chambers Gland 62 ytoiatmosphere throughportsf64 and-65,fpassage 63,-pip'e126 and the exhaust port 'of thevalve.Consequently the air admitted 1 into 'chamber 60 elevates the plunger*and increasesnth'e clearance between the squeeze'head 45 fand-,thellaslilsupporting tablea 23.v ALoek 67:'automatically limits the upwardmovementr olil the plunger. The squeeze headisswung laterally out ofregster with the table and a flask l2" is placed upona pattern plate Pwhich is supported by the =table` 23 and secured thereto Iasindicated at134. The pattern plate carries a pattern P projecting upward into theflask. In order to :holdv the'vflask. true upon the pattern: plate theplate is provided with :the usual retaining pins'135 whichprojectithrough apertured ars'lformed upon."r/)fppdsitesidesof theflask. yHaving v-p'osit-ionedfthe flask it is charged with sand'and'thexjolting operation issprforned zbyv pressing y the 'lever 32linward: '.'lhisl retractsv the bolt f 35 and". opens the' valve 30 fortheadmi'ssion ofcompressed air to Ithe lower end :of the jolt cylinderthrough ports-'25- and 27 .Therebythe jolt piston "is raised until-itbpensthe; exhaust port T29 whereupon it vdrops for 'jolting the sand.vVillleni this has been repeated sufliciently .the lever is released,4whereupon the1 valve 30 is automatically closed and the'bolt 85deautomatically projeted'invvard by the; contrac-tionv ofspringy 34for-locking the jolt piston. u v

fAsqueez'e boa-rdror bottom board B is next placed upon 'the s-ndinthe'flaslr; squeeze head' 45 is swung backV into lregister w'ith theHasln-'and .valve 125 is' operated for the moldsqueezing bperationrvThrough said valve compressedz air7 supplied through thetrunn-ion';1-is r'admitted to pipe *126' and-thence throughstenrpas'sage63 and ports 64 and totplfunger.l chambers (S1-and 62. Heresaid-air operates upon'pisto'ns 50 and 48 fto foree-'the".plunger'oWnWard' and press the squeeze head l'145 f against @the presser board Bto squeeze the mldi "It Wi xbe'sunderstood that .tbezva-lvef-125 in fitsh mold-squeezing adf `iustment'vents thejc'hamber 60 to atmosphere;The pressure developed in chambers 61 and'- 62 eiertedlu-ponth'ecooperatingjpistons 48 and 50 -causesi an effective 'squeezing =By theyprovision of tandem expansion chambers'-and4 pistons, iasshown,"'thepiston and"cylinder diameters are greatlyreduced andl themecha: nism isgivenfan elongatedfo'rm suitable for supporting the jolting mechanismand the squeeaefhead in spaced relation and for carrying the trunnio'n-11;V

I Vhile 'holdingl the partsfinsquee'zing position the 'valve 89 '-isoperated for the roll-over by pulling the appropriatehand-le A122Qat thefront of the' machinef 'lhe'` -valvel admits com'- pressed'air ytortheupper-end of cylinder 82 and exhausts 'it 'from the lower'end thereofI said spaces must be vented. The

to cause the roll-over of the mold-forming unit 2 and the inversion ofthe flask. During the roll-over the flask and mold are held clamped inposition by the squeezing mechanism and, at the conclusion of theroll-over the weight of the flask and mold rests upon the squeeze headwhich then serves as a flask support.

Vhile maintaining the rolled over position of the unit 2 and the flaskthe valve 125 is operated for causing the pattern-drawing operation. Airis thereby exhausted from the plunger chambers 61 and 62 through theports 64 and 65, passage 63. pipe 126 and the valve exhaust port.Thereby the plunger 14 and the squeeze head 45, with the supported flaskand mold, are permitted to gravitate away from the table 23. Since thetable carries the pattern P the latter is withdrawn from the mold by therecession of the squeeze head. In rolled over position the hook 67 liesin an inoperative position upon the plunger head 46 to permit thegreater movement of the plunger for pattern drawing. The

'f flask is next removed from the inverted squeeze head, and the valve89 is operated from the front of the machine by the appropriate handle122 to cause the roll-back movement of the mold-forming unit. rlhe valvedoes this by exhausting air from the upper end o-f cylinder 82 andadmitting compressed air to the lower end of the cylinder.

The mold-forming unit is designed and supported for substantiallybalanced rotation so that little power is required for the roll-over androll-back movements. These movements are cushioned by the restrictedexhaust of air from the cylinder 82 through the bleed ports 110 in thecheck valves 109.

It is obvious that the volumes of the plunger and cylinder spacesbetween pistons 50 and 59 and between piston 48 and the lower end ofcylinder 9 will vary in the reciprocation of the plunger. Consequentlylower space, with reference to Fig. 2, is vented directly to atmospherethrough ports 136 in the closed end 10 of the cylinder, and the upperspace is vented through ports 137 in the plunger which open intolongitudinal grooves 138 formed in the inner walls of the cylinder .andlead into said lower space. The plunger is held against turning in thecylinder by a set screw 139 threaded through the cylinder and engagingin a longitudinal slot 140 formed in the outer wall of the plunger.

Vhat we claim is:

1. A molding machine comprising a rollover unit including a flasksupport mounted for shifting to jolt the sand in a supported flask,fluid pressure operated means to shift said support for jolting, lockingmeans to hold said support against shifting, manually operable meansoperatively connected to said locking means and said fluid pressureoperatedmeans to release the locking means and cause Athe ,joltingoperation, and means to automatically applythe locking means after thejolting'operation; and a mounting for said'unit supporting it forrotation to roll over the flask.

' 2. A molding machine comprising amoldforming roll-over unit includinga pair of opposed flask supports spaced apart to accommodate a flaskbetween themr and permit it to rest uponV one lof said supports, fluidpressure operated iolt mechanism to vertically shift the latter supportfor vjolting the sand in the mold, locking rmeans to prevent saidvertical shifting of said support, lcontrol means for the joltmechanism, manually operable means operatively connected to said lockingmeans. and to said jolt control means for releasing the vlocking meansand causing the jolting operation, means to automatically vapply said.locking means at the conclusion of the jolting operation,pattern-holding means carried by said latter flask support, and means tomove one support toward the other to squeeze the interposed mold in theflask and hold the flask during the roll over; and amounting for saidunit supporting it for rotation to roll over the flask and transfer itsweight. fromone support to the other, one support being shiftable awayfroml the other for drawing the pattern and `said locking meanspreventing dropping of the jolt-operated support when the pattern ldrawing occurs.

'3. A molding machine comprising a pair of opposed flask supports; afluid pressure operated mold-squeezing and pattern-drawing mechanismconnecting said supports and supporting them in spaced relation in aunit; a trunnion carried by said mechanism and extending laterally fromit; and a mounting for` said trunnion supporting said unit for rollingover to vinvert the flask and transfer it from one support'v to theother. i

4. A roll-over molding machine comprising a pair ofopposed flasksupports; avfluid pressure operated mechanism supporting said flasksupports in spaced rela-tion in a'unit, said mechanism being operableforshifting one llasksupport toward the other supportv for mold squeezing;and a mounting for said fluid pressure operated mechanism supporting theunit through the medium of said mechanism for rotation about a lateralaxis to roll over and invert the flask and transfer its weight from onesupport to the other.

5. A molding machine comprising a pair of flask supports; a roll-overunit comprising a telescoping fluid pressure operated mechanismsupporting said flask supports laterally offset therefrom in opposedspaced relation to receive a mold flask therebetween, said mechanismbeing operable by fluid pressure to longitudinally contract it and movelli onel of. said supportsl toward the other to squeeze ay mold in aninterposed ilask and being operablegto longitudinally extend `it to moveone of said .supports awayv from the other for pattern-drawing; `.andamounting for said mechanism supporting the unit through themediumo'f'said mechanism for rotation about a lateral axis to roll over theflask and-transfer the weight of the flask from one of said supportstothe other. :64A molding machine comprising a pair of flasksupports; avroll-over unit comprising a. fluid pressure operated mechanismsupporting said'l'lask supports laterally offset therefrom in opposedspaced relation to receive a Vmold fla-sk therebetween and comprisingmeans forming a plurality of iuid pressure chambers in tandem relationand each having a shiftable Wall operatively connected to one oftherlask supports, said Walls being shiftable in unison in the samedirection by fluid pressurevapplied in said chambers to the same side ofeach Wall to move said operatively connected lask support toward theother support for mold squeezing and shiftable in the opposite directionto move one of said supports away from the other for pattern-drawing;and a mounting-for said mechanism vsupporting the unit through themedium of ,said mechanism for rotation about a lateral axis to roll overthe flask and transfer the vWeight of the lask vfrom one of saidsupports to the other.V

7. A molding machine comprising a rollover unit including a pair ofopposed flask supports spaced apart to `accommodate a {ias-k betweenthem, mechanism'to shift one of 'said .supports toward and from theother for ,squeezing and releasing the mold, and gra-vityoperatedlocking means to limit the movement of said shiftable support away fromthe other support; and amounting for said unit supporting it forrotation to roll over the flask, said locking means being releasable by:gravity when the unit is rolled over to permit `greater movement of theshift` able support away from the other support for pattern drawing.. v

In testimony whereof We hereunto alix our signatures this 15th day 'ofNovember, 1930.

WILLIAM NICHOLLS. ARTHUR D. 'ZIEBRTL

